Four Seasons 20891 HVAC Binary Switch

Four Seasons 20891 Pressure Switch Overview

The Four Seasons Pressure Switch 20891 is a system-mounted HVAC binary switch built for pressure-based control in the air conditioning circuit. It uses a rectangular female connector, a 10mm x 1.25 female thread, and a 4-terminal metal construction to support reliable electrical and refrigerant-system communication.

Compatible With 2004-2007 Ford E-350 Super Duty, 2004-2005 Ford E-350 Club Wagon, and 2000-2001 Jeep Cherokee, this pressure switch is a direct-fit service part for vehicles that use the listed system-mounted configuration. The Four Seasons 20891 part number is also referenced in common aftermarket interchange listings for the same application.

Key Features

• Four Seasons Pressure Switch line for HVAC system control
• Binary switch design with open/closed pressure operation
• System-mounted configuration for direct service replacement
• Rectangular female connector with 4 terminals
• Female fitting with 10mm x 1.25 thread size
• Metal housing for durable underhood use
• Meets or exceeds OEM requirements
• Operate pressure points: 250 psi low off, 280 psi low on

Detailed Product Description

The Four Seasons 20891 is an HVAC binary pressure switch used to monitor system pressure and signal the air conditioning circuit when pressure reaches the specified thresholds. Its open/closed switching logic helps the HVAC system respond to pressure changes in a controlled way, while the system-mounted design supports direct replacement on the vehicle’s refrigerant circuit. This part is commonly searched as a Ford E-350 Super Duty pressure switch, Ford E-350 Club Wagon pressure switch, and Jeep Cherokee pressure switch.

Built with a metal body, rectangular female connector, and 10mm x 1.25 female thread, the Four Seasons 20891 is specified for vehicles that require this exact connector and mounting style. Cross-reference part numbers for the same application include UAC SW11175C and Global Parts Distributors LLC 1711655.

What This Part Helps Address

• HVAC compressor cycling caused by pressure switch failure
• Air conditioning cutout from incorrect system pressure signaling
• Intermittent compressor engagement on Ford E-350 Super Duty and E-350 Club Wagon applications
• Pressure-related HVAC faults on 2000-2001 Jeep Cherokee models
• Electrical connection issues at the system-mounted pressure switch

Installation Notes and Tips

Verify the connector shape, terminal count, thread size, and mounting location before installation. This part is a system-mounted HVAC pressure switch, so the replacement should match the vehicle’s original pressure-switch configuration exactly. Confirm fitment for 2004-2007 Ford E-350 Super Duty, 2004-2005 Ford E-350 Club Wagon, or 2000-2001 Jeep Cherokee before service.

Quality Assurance

Four Seasons states that this pressure switch meets or exceeds OEM requirements. The 20891 part number is part of the Four Seasons Pressure Switch line, which is used for HVAC service applications requiring accurate pressure-based switching and OE-style fitment.